Handle for percussive tools



Aug. 19, 1924.

w. PRELLWITZ HANDLE FOR PERCUSSIVE TOOLS Filed June 13 1921 INVENTORmllimnf'ci ill/319,.

Patented Aug. 19, 1924.

UNITED STATES PATENT OFFICE.

WILLIAM PRELL WITZ, F EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RANDCOMPANY QJOF JERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY.

HANDLE FOR PERCUSSIVE TOOLS.

Application filed June 13, 1921. Serial No. 477,189.

To all whom it may concern:

Be it known that I, \VILLIAM PRELLWITZ,

a citizen of the United States, a resident of Easton, county ofNorthampton, and State of Pennsylvania, have invented a cer tain Handlefor Percussive Tools, of which the following is a specificationaccompanied by drawings.

This invention relates to handles for percussive tools such as rockdrills, but. more particularly to an improved handle especially adaptedfor the type of drill known as a Jackhammer which may be held by theoperator. Such handles are usually secured to the back end of thecylinder casing of the rock drill and may form the back head, and withthe open type of handle, although equipped with handle bars, theoperator is apt to thrust a crow-bar throu 'the open grip in order totwist the dril steel loose when it sticks, sometimes breaking thehandle. 1

Other rough usage may also break the 2 handle, and the objects of thepresent invention are to avoidbreakage and produce a simple and stronghandle of the closed type so constructed that the operator eithercannot, or can only with great difficulty, insert a bar into the handle,and must depend upon the handle bars for manipulating the machine whenrequired, as intended.

Farther objects of the invention will her inafter appear and to all ofthese ends the invention consists of the device shown in theaccompanying drawings, in which- Figure 1 is a side elevation of aporoussive tool in the form of a rock drill of the Jackhammer type,having my handle barapplied thereto, only so much of the details of therock drill being shown as will serve to illustrate the invention.

Figure 2 is an enlarged detail side View of my improved handle.

Figure 3 is an end view of the handle, and

Figure 4 is a transverse sectional view through the handle on the line44 of Figure 2.

Referring to the drawings, which illustrates a preferred form of theinvention, the cylinder casing A of the rock drill is provided with thefront cylinder extension B and the front head G into which the drillsteel extends in position to receive the impact blows of a hammeradapted to reciprocate in the cylinder.

The handle E, constructed in. accordance with my invention, forms theback head of themachine and the parts so far described are held togetherby means of the usual side bolts F passing through the lugs G and H onthe handle, the lugs J on the cylinder A and the lugs K on the fronthead C. The usual valve casing L is shown at the side of the machineadapted to contain a fluid actuated distributing valve and fluidpressure is supplied to the inlet 0 and exhausted to atmosphere at theexhaust outlet P.

My improved handle comprises a base Q formed with a hollow grip R-integral therewith, closed at both ends S and at one side T, theopposite side U being open for the insertion of the fingers of anoperator. Recesses or pockets V formed on the closed ends S reduce thewalls at these port-ions so that they are thinner than the remainder ofthe sides to decrease the weight of the handle and provide increasedspace for the thickly gloved hand of the operator. A rib W preferablyextends longitudinally along the inside of the crown X of the grip fromend to end for strengthening purposes and in order to afford convenientgripping means for the fingers. A handle bar Y having the handles Zpreferably extends longitudinally through the grip beside the rib W toenable the machine to be manipulated I? both hands of the operator. Thebar also cooperates with the rib W so that the interior of the gripcomfortably fits the hand of the operator. The space R between the bar Yand the wall T of the handle afiordsan additional space or pocket forthe ends of the fingers of the operators love.

My hollow grip may be cast or otherwise formed in one piece with theexception of the handle bar Y which is adapted to be secured to the gripand have the handles Z secured thereon as by means of the nut 01. Theconstruction is light and strong, withstands rough usage withoutbreakage and prevents the insertion of a crow-bar through the handle fortwisting the drill steel loose so that only the handles Z provided forthis purpose will be used by the operator, as intended.

I claim:

A handle for percussive tools, comprising in combination a cylinder, aback head and a hollow grip integral with said back head,

6 said grip being completely closed at both ends and at one side bysolid walls, the opposite side being open for the insertion of thefingers of an operator, and astrengthening rib extending longitudinallyalong the inside of the crown of the grip frornend to end, said gripbeing adapted to prevent the insertion of a turning implement throughthe handle from side to side, a removable handle bar extendinglongitudinally through the grip, a. portion of said handle bar lyingbeside the said rib within the grip and providing a convenient hand holdfor the operator.

In testimony whereof I have signed this specification.

- WILLIALM PRELLWITZ.

